Group VII A or XVII or Halogens.
Group-17 in the periodic table gains electron most readily. The elements in this group require only one electron to complete its octet.
The Alkali Metals, which are the elements in Group 1 of the periodic table, each have one lone electron in their valence shell. And each of these elements wants to get rid of that single electron. These metals, which include lithium, sodium, potassium, rubidium, caesium and francium, are the most likely to lose electrons.
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the group number of the periodic table shows the valence electron. such as :- sodium is placed in group 1 and have valence electron.
group 17 - the halogens
Alkali metals, Ist group.
Bi
elements of group 17 (most readily) followed by group 16 and group 15
group #1 on the periodic table is called alkali metals, has one valence electron, and is the most active metal group.
Halogens family have 7 valence electrons.They belongs to family 17 on the periodic table.They are highly reactive as they accept electron readily to complete their shell.
In the periodic table, group indicates the number of valence electrons in the outermost shell. E.g. Group I- the elements in that group have one valence electron in the outermost shell.
The elements of group 1 has 1 valence electron. They lose 1 electron to form cation.